What’s the model / how much is it worth

Hi!
I've had this bike for a while but it's become too small for me. I was thinking of selling it but I have 0 knowledge on bikes so what model is it? And what is it worth? I'm still deciding if the value is worth more than my sentimental value so I'm hoping someone can help me.

Oh and I'm hoping I'm not breaking any rules of this subreddit. I don't want to sell it here, I just wanna gather knowledge